Changes:

- use toggle tile for all toggling entities (transient, switch, door)
- get rod of hard coded sprites (exception: particle class, to be
  fixed later)
- changed switch sprite (rect instead of elipse)

components/components.go

@@ -7,6 +7,7 @@ import (
 // virtual location, aka tile address
 
 type Renderable struct {
+	Pos         *Position // just for debugging, will not used as positiion!
 	Image       *ebiten.Image
 	DamageImage *ebiten.Image
 	Damaged     int

components/transient.go

@@ -1,24 +1,10 @@
 package components
 
 import (
-	"log"
+	"github.com/hajimehoshi/ebiten/v2"
 )
 
 type Transient struct {
 	Activated bool
-	Sprites   []string
-	Current   int // sprite index
-}
-
-func (trans *Transient) GetNext() string {
-	if len(trans.Sprites) > trans.Current {
-		trans.Current++
-		return trans.Sprites[trans.Current]
-	}
-
-	log.Fatalf("not enough sprites in transient tile, have %d sprites, index requested: %d",
-		len(trans.Sprites), trans.Current+1,
-	)
-
-	return ""
+	Wall      *ebiten.Image
 }